RU34164U1 - Device for wastewater treatment from organic pollution - Google Patents

Description

Device for wastewater treatment from organic pollution

The utility model relates to the field of wastewater treatment containing organic compounds, and can be used for biological treatment of domestic and industrial wastewater.

Known devices for the biological treatment of water, biological filters 1 (hereinafter biofilters).

A biofilter is a treatment plant filled with loading material, through which waste water is filtered, and on the surface of which a biological film is formed, consisting mainly of aerobic microorganisms. Wastewater treatment is carried out due to the vital activity of these microorganisms. By the nature of the loading material, biofilters are divided into two types: with volumetric (granular) loading and flat loading.

As a granular load, crushed stone of strong rocks, pebbles, expanded clay, etc. are used, and as a flat one - as a hard backfill - plastic in the form of rings, pipe cuts, balls - as a hard block load - flat or corrugated sheets mounted in blocks. According to the type of soft planar loading, metal nets, polymer films or synthetic fabrics attached to frames or laid in the form of rolls.

003117632

IPC 7 C02F 3/00

The biomass in the biofilter is concentrated on the surface of the loading grains, and the larger the surface area of the loading of the biofilter, the greater is the specific gravity of active microorganisms that will dry; e biofilters with a fine-grained loading, for example, of plastic.

The disadvantage of biofilters is the need for their placement; they are in closed heated rooms; In addition, in case of violations of the technological regime, for example, when toxic substances get into sewage, active biomass dies - a biofilm that takes a long time to recover, and in some cases a complete discharge with washing or replacing the entire granular load is necessary. The bottleneck of the biofilter is also waterlogging of the load (dead zones), clogging with fibers, the difficulty of dispensing effluents along the surface of the biofilter, and the access of oxygen necessary for the oxidation of organic substances is difficult.

Wastewater treatment plants are also known - aeration tanks 2. Aeration tank is a tank in which wastewater is treated as a result of the activity of microorganisms of activated sludge. The main element of the aeration tank is the aerator. Waste water in the aeration tank is continuously aerated and moved until it is saturated with oxygen. Active sludge is a suspension of microorganisms capable of flocculation. The aeration tank has an inlet of purified water and activated sludge at the beginning of the construction and removal of the sludge mixture at the end of it.

The introduction of activated sludge at the beginning of the construction provides an active increase in the rate of biological oxidation of contaminants, which reduces the time of their oxidation, but changing the composition of water along the way decreases the activity of the biooxidation process. The oxidation rate depends on the mass of microorganisms per unit volume of the aeration tank. In addition, due to jet streams, a breakthrough of unoxidized contaminants occurs.

In this regard, aeration tanks are used to treat relatively weakly polluted domestic wastewater and similar industrial waters.

The aeration tank is less sensitive to overloads and changes in the composition of effluents than a biofilter. It can quickly restore its efficiency by regulating the supply of activated sludge and air.

However, in the case of an uneven supply of air into its volume, uneven mixing of the wastewater with oxygen in the volume of the aeration tank occurs. The consequence of this is the occurrence of zones of uneven oxidation of organic substances in the volume of the aeration tank, which is its drawback.

In addition, the aeration tank is characterized by a lower specific gravity of activated sludge in the volume of the aeration tank compared to the specific gravity of the biofilm in the working volume of the bio-filter.

Also known devices for wastewater treatment - biotenki 3. Biotenk - aeration structure with a special load, contributing to an increase in the volume of biomass. Process

biological purification in biotank occurs both with the use of freely floating activated sludge and with a biological film growing on the loading material, due to which biotenes have a higher oxidative power compared to conventional aeration tanks.

Loading biotenka is carried out in the form of individual cassettes or blocks of hard plastic or flexible materials. Between the bottom, the walls of the biofuel and the load there are gaps for the circulation of wastewater, which prevents the sludge from falling to the bottom of the structure. It is possible to extract individual cassettes or blocks from the bioten. The loading itself is located in the zone of relatively low speeds of water movement, which contributes to the growth of biological mass on the loading material.

For these cassettes, elements consisting of synthetic materials providing the formation of a biological film have been developed. Elements loaded into cassettes are intended to create a spatial structure in biological treatment plants with a developed surface, which provides the buildup and retention of specific microflora, adapted for the destruction of difficultly oxidized wastewater pollution, and also has a high filtering ability.

A device for wastewater treatment company Green is known, made in the form of a cartridge with Volan nozzles. Nozzles are made in the form of volumetric elements - shuttlecocks rolled up from a polyethylene mesh sleeve covered with a net. Rolled shuttlecocks are loaded into bulk on the bottom of the bioten.

However, this disrupts the hydraulic mixing of water in the aeration tank, which leads to different concentrations of oxygen in the cross section of the biofuel, the creation of zones with a small concentration of oxygen, and, as a result, the insufficient degree of oxidation of pollution in these zones.

The lack of oxygen in the zones of dispersal; the formation of these nozzles creates anaerobic conditions for the development of microorganisms (stagnation, decay).

The closest to the claimed technical essence and the achieved result is a wastewater treatment device 4 developed by the same company, representing; it is a cassette in the form of a parallelepiped welded from corners and covered with a mesh, inside of which, in rows, perpendicular to the flow of cleaned water, nozzles are stacked - rigid mesh tubes (Noli Green) made of polypropylene.

Cartridges in aeration tanks are placed perpendicular to the flow of water. However, the inserts in the cassette have an insufficient surface on which a biofilm is formed. Also, as the air moves

bubbles up, the latter scatter, which does not allow

the resulting biofilm with sufficient oxygen.

The utility model is based on the task of creating a device for treating wastewater from organic contaminants, which provides an increase in oxidative damage, improved quality and quality of treated effluent, by developing a surface that ensures biofilm growth and retention, providing it with sufficient oxygen.

The problem is solved in that in a device for wastewater treatment from organic contaminants, mainly in aeration tank, made in the form of a block of cartridges, each of which consists of nozzles in the form of mesh pipes, laid in it and interconnected in such a way, each pipe is made of fiberglass cord impregnated with quick-hardening resin and filled with a charge, the density of which does not exceed the density of the water being cleaned, each cassette is equipped with a protective cover - a float made of porous material, whose weight is less than the specific gravity of the treated water.

The device is equipped with an aerator in the form of a perforated air supply pipe located at the base of the cartridge block with the possibility of connecting to the aeration tank air duct.

As the load, polymer chips or granular load can be used.

between rollers mounted on brackets mounted on opposite sides of the aeration tank.

Filling a hollow mesh pipe with a baffle (for example, from polyurethane foam) creates a developed specific surface per unit volume of load, which allows to increase the active mass of the biofilm.

The execution of the nozzle in the form of a pipe made of a fiberglass cord impregnated with quick-hardening resin ensures the structural strength of the claimed device and allows loading of the internal volume of each pipe.

Connecting the pipes into separate cassettes allows you to place them in mutually perpendicular planes and reduce the so-called dead zones, thereby increasing the cleaning efficiency.

The supply of the device with an aerator, in the form of a perforated air supply pipe, fixed at the base of the cartridge with the possibility of connecting to the air duct, provides more intense saturation of the cartridge’s space with air bubbles of small diameter, which increases the biooxidation efficiency in the cartridge’s volume, allows concentrating the air flow in the device’s volume and maximize the oxygen supply air.

In FigL presents a section of the inventive device: in Fig.2 - cassette with vertically arranged mesh pipes, in Fig.Z - cassette with horizontally located mesh pipes laid in mutually perpendicular directions.

The wastewater treatment device installed in the aeration tank 1 is made in the form of blocks 2, consisting of cassettes 3, each of which consists of mesh pipes 4, laid in it and interconnected so that the height of the block 2 and the number of cassettes 3 in it correspond to the size of the stream of purified water in the aeration tank 1.

Each pipe 4 is made of a fiberglass cord impregnated with quick-hardening resin 5, and is filled with a charge 5, the density of which does not exceed the density of the treated water. Each cassette 3 is equipped with a protective cover - a float 6 made of a porous material, the specific gravity of which is less than the specific gravity of the purified water.

The pipes 4 in the cassette 3 are interconnected by means of fasteners (not shown in the drawing). The device is equipped with an aerator in the form of a perforated air supply pipe 7, located under the block 2 along it, and made with the possibility of connecting to the air duct 8 of the aeration system (not shown) aeration tank 1

The device is also equipped with suspensions 9 for mounting it in the aeration tank 1, which can be fixed, for example, on a cable 10, stretched between the rollers 11 mounted on brackets 12, mounted on opposite sides of the aeration tank 1.

The device operates as follows.

between the rollers 11 mounted on the brackets 12. In this case, the height of the block 2 and the number of cassettes 3 in it correspond to the dimensions of the flow of water being cleaned in the aeration tank 1.

The perforated air supply pipe 7 is connected to the air duct 8 of the aeration tank 1 aeration system. This completes the preparation of the device for operation.

Then, purified water is passed through aeration tank 1, which, passing through pipes 4 of cassettes 3 of blocks 2 through load 5, which forms a spatial structure with a developed surface, which in turn forms the growth and retention of specific microflora in the form of biofilm, which destroys difficultly oxidized contaminants, is subjected to biological treatment . At the same time, air bubbles of air supplied through the perforated pipe 7 of the air supply, carry out additional oxidation of contaminants inside the volume of each cartridge 3.

List of references

1.Porutsky G.V. Biological wastewater treatment of organic production M., Chemistry, 1975.

2.Kovaleva N.G., Kovalev V.G. Biochemical wastewater treatment of chemical enterprises. M. Chemistry, 1987

3. Sewerage of populated areas and industrial enterprises. Designer reference. Under the general editorship of V. N. Samokhin. M., Stroyizdat, 1981, p. 253-255.

4. Prospect of the environmental company Green Frog, 105123, Moscow, ul. Suvorovskaya, d.27, 20025

5. Patent of the Russian Federation 2176991, bull. No. 3 5

Claims (4)

1. A device for treating wastewater from organic contaminants, mainly in an aeration tank, made in the form of a block of cassettes, each of which consists of mesh pipes laid in each cassette, and interconnected so that the height of the block of cassettes and their number in the block correspond to the size of the stream of purified water, characterized in that each pipe is made of a fiberglass cord impregnated with quick-hardening resin, and is filled with a load, the density of which does not exceed the density of the purified water, each cartridge equipped with a protective cover-float made of a porous material, the specific gravity of which is less than the specific gravity of the purified water. 2. The device according to claim 1, characterized in that it is equipped with an aerator in the form of a perforated air supply pipe located under the cartridge block along it and configured to connect an aeration tank to the air duct. 3. The device according to claim 1 or 2, characterized in that as the load can be used polymer shavings or granular load. 4. The device according to claim 1, or 2, or 3, characterized in that it is equipped with pendants to strengthen it in the aeration tank.